There's no shortage of emulators for older gaming consoles on modern mobile platforms. The latest addition to the list is PPSSPP, a PSP emulator that self-admits to being a work in progress. Of course, there are a couple of things you should know up front: for starters, it's possible this won't last long on the Play Store, since emulators tend to have a pesky problem with legal and policy gray areas. Secondly, the app is still in early development, so many games will likely not work. You should expect a level of beta-ness on this one. Heck, it's only listed as version 0.2.

As always, this is a bring-your-own-rom situation if you want to play any games, and there's no guarantee that any of the ones you get will work. Still, it may be fun to try out. If you want to help improve the emulator or work on the project, you can read more about it here.

I never understood that either, I am guessing that Yongzh's emulators were popular enough to grab the attention of people who didn't like them.

I always feel the Play Store isn't nearly regulated well enough, way too many BS apps on there that don't make sense (defragmenter anyone?).

Protato

My understanding is that Google removed all his emulator apps because he used open source PC emulator code in his emulators and made money off it which was against the licenses that the emulators had.
tl;dr he made $$$ of other people's work

I remember XDA mentioning that but came to the conclusion that wasn't enough RAM to support both the Android OS and the PSP one. Though it was entirely rough and theoretical so anyone is welcome to prove me wrong: